California’s Bay Area Rapid Transit (BART) is aiming to start construction on a second tube under the San Francisco Bay within the next decade, as transit planners anticipate population and job growth that could overwhelm the Bay Area’s stressed rail system. In mid-November, BART directors received an update on early steps toward a second BART crossing that could include both standard-gauge rail tracks and the wider BART tracks, which could allow riders to have a one-seat ride from ...